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http://dx.doi.org/10.7843/kgs.2007.23.8.17

A Study of Obtaining Reliable Travel Time Information in Downhole Seismic Method  

Bang, Eun-Seok (Geotechnical Engineering Division, KIGAM)
Lee, Sei-Hyun (Dept. of Civil and Environmental Engrg., KAIST)
Kim, Jong-Tae (Dept. of Civil and Environmental Engrg., KAIST)
Kim, Dong-Soo (Dept. of Civil and Environmental Engrg., KAIST)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.8, 2007 , pp. 17-33 More about this Journal
Abstract
Downhole seismic method is widely used for obtaining shear wave velocity profile of a site because it is simple and economical. Determining accurate travel time of shear wave is very important to obtain reliable result in downhole seismic method. In this paper, comparison study of various travel time determination methods was performed. Numerical study and model chamber test were performed for effective comparison study. Signal traces were acquired by performing downhole test at each numerical simulation and soil box test. Travel time data for each signal traces were determined by using six different methods and Vs profiles were evaluated. Comparing travel time data and Vs profiles with the reference value, the first arrival picking method proved to be ambiguous and unreliable. Other methods also did not always provide accurate results and the magnitude of error was dependent on the signal to noise ratio. Cross-correlation method proved to be the most adequate method for the field application and it was verified additionally with field data.
Keywords
Chamber test; Downhole seismic method; HWAW; Numerical analysis; Travel time;
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